Firefox has an blacklist of GPUs, you can override it. Open "about:config" and set both "webgl.force-enabled" and "layers.acceleration.force-enabled" to 'true'. If you get any problems during testing, try disabling "layers.acceleration.force-enabled" first.

Expected Results

The Firefox running WebGL should not crash at any point. If you encounter any crash, think about reporting it against Firefox component. Remember, if you have 'force-enabled' WebGL on your blacklisted GPU.

There should be no obvious misrendering (flickering, transparent walls, polygons instead of surfaces...).

You can see reflections on surfaces and shadows, if available and enabled). If you see distinct polygons instead of smooth surfaces, this is a rendering bug.